Other Brain Hacks #1

Hi everyone!

I'm Fabricio, Steph Noble's postdoc at Northeastern. Nice to meet you all!

I added our Precision Brain and Mental Health Hack Boston to the repository, but I noticed several other brainhacks in data/locations.yaml are missing the image field, which causes the generate_events_page.py script to fail with a KeyError.
The incomplete events are:

Brainhack Donostia
Brainhack Toronto
Brainhack Montreal
Brainhack Marseille (the active one, not the test one)
Brainhack Lucca

Before I submit my PR, could someone let me know:

Are these events confirmed and their organizers will complete the information?
Is it okay if I add image: null to these entries so the script can run?
Or should I wait until these are updated before submitting?

I want to make sure I don't step on anyone's toes or break the workflow you have established.
Thanks!
Fabricio